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Efficacy and safety of eculizumab in childhood atypical hemolytic uremic syndrome in Japan

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Abstract

Background

Atypical hemolytic uremic syndrome (aHUS) is a severe life-threatening disease with frequent progression to end-stage renal disease (ESRD). Eculizumab, a humanized anti-C5 monoclonal antibody targeting the activated complement pathway, has recently been introduced as a novel therapy against aHUS. We, therefore, investigated the efficacy and safety of eculizumab in Japanese pediatric patients.

Methods

We retrospectively analyzed clinical course and laboratory data of the first ten children with aHUS treated with eculizumab nationwide.

Results

Seven patients were resistant to plasma therapy and three were dependent on it. Causative gene mutations were found in five patients. Two patients had anti-complement factor H autoantibody. Three patients had a family history of thrombotic microangiopathy (TMA). After initiation of eculizumab, all patients immediately achieved hematological remission and could successfully discontinue plasma therapy. The median periods to normalization of platelet count, lactate dehydrogenase levels and disappearance of schistocytes were 5.5, 17 and 12 days, respectively. Nine patients recovered their renal function and the median period to terminate renal replacement therapy (RRT) was 3 days. However, two patients progressed to ESRD and required chronic RRT at the last observation. No patients had a relapse of TMA under regular eculizumab therapy. No serious adverse events occurred during the follow-up period.

Conclusions

Eculizumab is efficacious and well-tolerated therapy for children with aHUS. Although pathogenic mutations could not be detected in five patients, all patients showed immediate normalization of hematological abnormalities, strongly suggesting complement-related aHUS. This prompt hematological amelioration can become an indicator for therapeutic efficacy of eculizumab. However, appropriate indications and optimal duration of the treatment remain unclear.

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Acknowledgments

The authors would like to thank the following co-investigators for their contributions to this study: Kenji Ishikura (Tokyo Metropolitan Children’s Medical Center), Koichi Kamei (National Center for Child Health and Development), Tomohiro Udagawa (Tokyo Medical and Dental University), Tomohito Takimoto, Masamitsu Shirozu and Manao Nishimura (Kyushu University). We also appreciate Yoko Yoshida (Nara Medical University) and Toshiyuki Miyata (National Cerebral and Cardiovascular Center) for performing hemolytic assays, anti-CFH antibody analysis and genetic mutation screening. Alexion Pharmaceuticals, Inc. provided eculizumab on compassionate grounds to seven patients in this study until eculizumab received approval for the indication of aHUS in Japan.

Conflict of interest

Potential financial conflicts of interest. Patent royalties: Yoshihiro Fujimura (Alfresa Pharma), Honoraria: Shuichi Ito (Alexion Pharma), Research funding: Yoshihiro Fujimura (Alexion Pharma). The other authors have declared that no conflicts of interest exist.

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Correspondence to Shuichi Ito.

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Ito, N., Hataya, H., Saida, K. et al. Efficacy and safety of eculizumab in childhood atypical hemolytic uremic syndrome in Japan. Clin Exp Nephrol 20, 265–272 (2016). https://doi.org/10.1007/s10157-015-1142-y

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  • DOI: https://doi.org/10.1007/s10157-015-1142-y

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